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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,751,268,167 | 475,511,771 | 475,511,771 |
| 2006 | $3,111,398,065 | 464,895,302 | 464,895,302 |
| 2007 | $2,822,902,795 | 382,832,603 | 382,832,603 |
| 2008 | $2,848,892,911 | 385,024,000 | 385,024,000 |
| 2009 | $1,130,904,425 | 232,960,580 | 232,960,580 |
| 2010 | $1,232,288,865 | 167,544,125 | 167,544,125 |
| 2011 | $1,363,311,836 | 151,053,325 | 151,053,325 |
Note: Quantity represents Weight in kilograms
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